/ocr/ocrservice/src/com/googlecode/eyesfree/opticflow/ImageBlur.java

 1/*
 2 * Copyright (C) 2011 Google Inc.
 3 *
 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 5 * use this file except in compliance with the License. You may obtain a copy of
 6 * the License at
 7 *
 8 * http://www.apache.org/licenses/LICENSE-2.0
 9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations under
14 * the License.
15 */
16
17package com.googlecode.eyesfree.opticflow;
18
19/**
20 * Wrapper for native image blur detection code. Modified by Alan Viverette from
21 * Xiaotao Duan's original source.
22 *
23 * @author Xiaotao Duan
24 * @author alanv@google.com (Alan Viverette)
25 */
26public class ImageBlur {
27
28    /**
29     * Tests if a given image is blurred or not.
30     *
31     * @param input An array of input pixels in YUV420SP format.
32     * @param width The width of the input image.
33     * @param height The height of the input image.
34     * @return true when input image is blurred.
35     */
36    public static native boolean isBlurred(byte[] input, int width, int height);
37
38    /**
39     * Computes signature of a given image.
40     *
41     * @param input An array of input pixels in YUV420SP format.
42     * @param width The width of the input image.
43     * @param height The height of the input image.
44     * @param signatureBuffer A buffer for output signature. If it's null or not
45     *            in the right size, this buffer will be ignored and not used.
46     *            This is used to avoid GC.
47     * @return Signature of input image. If signatureBuffer is valid,
48     *         signatureBuffer will be returned. Otherwise a new array will be
49     *         returned and can be used as signature buffer in next function
50     *         call.
51     */
52    public static native int[] computeSignature(
53            byte[] input, int width, int height, int[] signatureBuffer);
54
55    /**
56     * Computes how similar of two given images represented by their signatures.
57     *
58     * @return An integer from 0 to 100 is returned indicating how much
59     *         percentage of signature2 is different from signature1.
60     */
61    public static native int diffSignature(int[] signature1, int[] signature2);
62
63    static {
64        System.loadLibrary("imageutils");
65    }
66}